State profile · Near national median SD

New Hampshire bridge safety

Condition ratings, load ratings, and structural-deficiency data for every public highway bridge in New Hampshire — drawn straight from the FHWA National Bridge Inventory.

2,542
Public bridges
43.0%
Good condition
7.1%
Poor condition
7.1%
Structurally deficient

Total Bridges

2,542

Public highway bridges in New Hampshire

Good Condition

43.0%

1,092 bridges rated 7-9

-7.0pp vs 50% benchmark

Poor Condition

7.1%

180 bridges rated 0-4

Structurally Deficient

7.1%

180 bridges flagged for repair priority

0.1pp vs national avg 7.0%

New Hampshire vs national bridge condition

New Hampshire — Good condition share 43.0%
National avg

Share of bridges rated 7-9 on the FHWA 0-9 scale (deck, superstructure, substructure all good).

New Hampshire — Structurally deficient share 23.6%
National avg

Lower is better. Bar maxes at 30% (worst-state ceiling). National average sits at 7.0%.

Condition Distribution

Bridge inventory deck-condition mix — New Hampshire (FHWA NBI)

New Hampshire42.95830055074744%35.641227380015735%GoodFairPoorStructurally Deficient
Bridge inventory deck-condition mix — New Hampshire (FHWA NBI)

Counties (10)

Belknap 112 Carroll 193 Cheshire 192 Coos 188 Grafton 544 Hillsborough 385 Merrimack 326 Rockingham 308 Strafford 136 Sullivan 158

New Hampshire vs nearby ranks

Adjacent states on the structurally deficient leaderboard (lower share = better)

States are ranked by share of bridges flagged structurally deficient — the FHWA classification for any span where deck, superstructure, or substructure carries a condition rating of 4 or below. Lower percentages indicate stronger maintenance funding and inspection follow-through. States here sit immediately above and below New Hampshire on the same metric.

36

New York

6.90% top marginal rate
Structure
Progressive
Burden @ $100K
$19,132

21

Kentucky

7.06% top marginal rate
Structure
Progressive
Burden @ $100K
$14,554
Selected

33

New Hampshire

7.08% top marginal rate
Structure
Progressive
Burden @ $100K
$2,542

40

Oklahoma

7.50% top marginal rate
Structure
Progressive
Burden @ $100K
$22,733

35

New Mexico

7.61% top marginal rate
Structure
Progressive
Burden @ $100K
$368

Bridges Needing Most Attention in New Hampshire

Six lowest-condition bridges in New Hampshire, ranked by composite NBI rating. Each is inspected at least every 24 months.

OLD DEERFIELD ROAD

Poor

Over: BROOK

185 FT FROM NH RTE 43, Rockingham, NH

Built 1920 Load: 1.8 t ADT: 190

TEMPLETON TURNPIKE

Structurally Deficient

Over: PRIEST BROOK

1.9MI. RTE 119, Cheshire, NH

Built 1984 Load: 2.7 t ADT: 86

DUDLEY ROAD

Structurally Deficient

Over: LAMPREY RIVER

.23 MI JCT 101, Rockingham, NH

Built 1914 Load: 2.9 t ADT: 535

SHOP ROAD

Structurally Deficient

Over: NEEDLE SHOP BROOK

0.8 MI N NEW CHESTER RD, Merrimack, NH

Built 1930 Load: 3.3 t ADT: 63

WHITCOMB MILLS RD

Poor

Over: WHITE BROOK

0.06 MI FR ARCH ST, Cheshire, NH

Built 1940 Load: 3.6 t ADT: 814

LEIGHTON MEADOW RD

Structurally Deficient

Over: PHILLIPS BROOK

100 FT FR SULLIVAN RD 61, Coos, NH

Built 1940 Load: 3.6 t ADT: 90

All Bridges in New Hampshire

NH101

Good

Over: TIDE MILL CREEK

1.2 MI FROM JCT US 1, Rockingham, NH

Built 1988 Load: 42.9 t ADT: 8,041

LEAR HILL ROAD

Good

Over: S BRANCH SUGAR RIVER

220 Ft.Fr. NH Rte 10, Sullivan, NH

Built 1991 Load: 42.9 t ADT: 283

CHICHESTER ROAD

Good

Over: BEE HOLE BROOK

0.4 MI S CHICHESTER TL, Merrimack, NH

Built 2006 Load: 43.0 t ADT: 1,701

US302,NH 16

Good

Over: ARTIST FALLS BROOK

6.2 MI FROM ALBANY TL, Carroll, NH

Built 1900 Load: 43.1 t ADT: 15,384

CHESHAM ROAD

Good

Over: MINNEWAWA BROOK

.91 MI. NE DUBLIN TL, Cheshire, NH

Built 1953 Load: 43.1 t ADT: 1,353

QUINCY ROAD

Good

Over: STINSON BROOK

2.9 MI. N. OF PLYMOUTH TL, Grafton, NH

Built 1937 Load: 43.1 t ADT: 920

MONT VERNON ROAD

Good

Over: CEASARS BROOK

0.7 MI E MOUNT VERNON TL, Hillsborough, NH

Built 2023 Load: 43.1 t ADT: 187

MANCHESTER STREET

Good

Over: PENNICHUCK RESERVOIR

AT NASHUA TL, Hillsborough, NH

Built 2015 Load: 43.1 t ADT: 4,378

US 4

Good

Over: BUNKER CREEK

1.8 MI W. MADBURY T.L., Strafford, NH

Built 2020 Load: 43.1 t ADT: 15,934

LUND LANE

Good

Over: ORE HILL BROOK

0.32 MI FROM NH RTE 25C, Grafton, NH

Built 2003 Load: 43.2 t ADT: 183

NH 16B

Good

Over: BEECH RIVER

.3 MI JCT. 16, Carroll, NH

Built 1932 Load: 43.3 t ADT: 2,052

JENKINS ROAD

Good

Over: MCQUADE BROOK

0.3 MI N. OF Merr. T/L, Hillsborough, NH

Built 2012 Load: 43.3 t ADT: 2,319

DAVIS CROSSING RD

Good

Over: ELA RIVER

1/4 MI. NORTH FROM RT. 11, Carroll, NH

Built 2010 Load: 43.5 t ADT: 90

NH 32

Good

Over: S BRANCH ASHUELOT RIVER

2.79MI. S. KEENE TL, Cheshire, NH

Built 2002 Load: 43.5 t ADT: 3,652

NH 3A

Good

Over: NEWFOUND RIVER

0.7 MI N OF JCT RTE 104, Grafton, NH

Built 1999 Load: 43.5 t ADT: 6,806

RIVER ROAD

Good

Over: MASCOMA RIVER

2.6 MI FROM DORCHESTERTL, Grafton, NH

Built 2010 Load: 43.5 t ADT: 90

US 4

Good

Over: MASCOMA RIVER

3.0 MI FROM ENFIELD TL, Grafton, NH

Built 2004 Load: 43.5 t ADT: 6,828

NH122

Good

Over: SOUHEGAN RIVER,REC PATH

2.35 MI N HOLLIS TL, Hillsborough, NH

Built 1956 Load: 43.5 t ADT: 6,692

WEBSTER MILLS ROAD

Good

Over: SANBORN BROOK

0.8MI. PITTSFIELD TL, Merrimack, NH

Built 2006 Load: 43.5 t ADT: 518

MANSION ROAD

Good

Over: STARK BROOK

TOWN RD, Merrimack, NH

Built 2018 Load: 43.5 t ADT: 90

US 4,US202,NH 9

Good

Over: SUNCOOK RIVER

.3 MI EAST JCT RT 28, Merrimack, NH

Built 1971 Load: 43.5 t ADT: 16,677

MAPLE STREET

Good

Over: HORNES BROOK

0.2MI. NH102, Rockingham, NH

Built 1998 Load: 43.5 t ADT: 1,485

NH 85

Good

Over: CSX

.45 MI SW JCT 108, Rockingham, NH

Built 2006 Load: 43.5 t ADT: 5,963

US 1

Good

Over: SAGAMORE CREEK

3.0MI N. OF RYE TL, Rockingham, NH

Built 2000 Load: 43.5 t ADT: 15,546

NH123A

Good

Over: BOWERS BROOK

IN S ACWORTH VILLAGE, Sullivan, NH

Built 2018 Load: 43.5 t ADT: 1,214

STAGE ROAD

Good

Over: LITTLE SUGAR RIVER

2.9 MI. CHARLESTOWN TL, Sullivan, NH

Built 1999 Load: 43.5 t ADT: 241

STANTON FARM RD

Good

Over: RAZOR BROOK

0.2 MI FR COBB RD, Carroll, NH

Built 1991 Load: 43.6 t ADT: 90

OSSIPEE MT ROAD

Good

Over: HALFWAY BROOK

1.6 MI. SANDWICH TL, Carroll, NH

Built 1949 Load: 43.6 t ADT: 354

NH 28

Good

Over: CSX(ABD)

1.6 MI WOLFEBORO T.L., Carroll, NH

Built 1959 Load: 43.6 t ADT: 4,489

US 2

Good

Over: RATTLE RIVER

2.9 MI EAST OF GORHAM T/L, Coos, NH

Built 1973 Load: 43.6 t ADT: 3,361

I-93 PARKWAY SB

Good

Over: I-93(RAMP 3S-F)

4.7 MI NO WOODSTOCK TL, Grafton, NH

Built 1986 Load: 43.6 t ADT: 5,020

I-93 PARKWAY NB

Good

Over: I-93(RAMP 3S-F)

4.6 MI NO WOODSTOCK TL, Grafton, NH

Built 1986 Load: 43.6 t ADT: 5,250

I-93 NB

Good

Over: HANSON BROOK

3.2 MI NO WOODSTOCK TL, Grafton, NH

Built 1984 Load: 43.6 t ADT: 5,250

REDINGTON STREET

Good

Over: AMMONOOSUC RIVER

0.3 MI FR BETHLEHEM TL, Grafton, NH

Built 2011 Load: 43.6 t ADT: 2,102

MEREDITH CENTER RD

Good

Over: OUTLET WICKWAS POND

1.3 MI NW LACONIA TL, Belknap, NH

Built 2019 Load: 43.7 t ADT: 4,167

I-93 SB

Good

Over: NHRR

0.6MI FR NEW HAMPTON T.L., Grafton, NH

Built 1963 Load: 43.7 t ADT: 10,717

I-93 NB

Good

Over: NHRR

0.6 MI FROM NEW HAMPTON T, Grafton, NH

Built 1963 Load: 43.7 t ADT: 10,714

US302,NH 10

Good

Over: WILD AMMONOOSUC RIVER

2.0 MI FR HAVERHILL TL, Grafton, NH

Built 1989 Load: 43.7 t ADT: 3,481

ROWENTOWN ROAD

Good

Over: S BRANCH BAKER RIVER

.2 MI FR NO DORCHESTER R, Grafton, NH

Built 1995 Load: 43.7 t ADT: 90

NH 3A,SO MAIN ST

Good

Over: PISCATAQUOG RIVER

0.04 MI FROM VARNEY ST, Hillsborough, NH

Built 1894 Load: 43.7 t ADT: 12,960

WARMAC ROAD

Good

Over: PERRY BROOK

0.83MI RTE 32, Cheshire, NH

Built 2013 Load: 43.8 t ADT: 90

ELM STREET

Good

Over: PAUGUS BAY

0.1 MI UNION AVE, Belknap, NH

Built 2003 Load: 43.9 t ADT: 5,633

DUNBARTON ROAD

Good

Over: BLACK BROOK

0.2 MI GOFFSTOWN TL, Hillsborough, NH

Built 1989 Load: 43.9 t ADT: 3,088

US 4,NH 16,TPK NB

Good

Over: LITTLE BAY,RD

DOVER-NEWINGTON T.L., Strafford, NH

Built 1966 Load: 43.9 t ADT: 33,527

NH 9

Good

Over: CONNECTICUT RIVER

RT9, NH/VT BORDER, Cheshire, NH

Built 2003 Load: 44.1 t ADT: 11,201

COBBLE HILL ROAD

Good

Over: CALIFORNIA BROOK

0.10MI RTE 10, Cheshire, NH

Built 2013 Load: 44.1 t ADT: 419

NH115

Good

Over: ISRAEL RIVER

1.2 MI SW JCT US RTE 2, Coos, NH

Built 1984 Load: 44.1 t ADT: 3,637

HAZEN ROAD

Good

Over: JOHNS RIVER

2.3 MI FR JEFFERSON TL, Coos, NH

Built 2020 Load: 44.1 t ADT: 90

SPRING STREET

Good

Over: GREAT BROOK

0.3 MI FR NH ROUTE 120, Grafton, NH

Built 1953 Load: 44.1 t ADT: 579

I-93 SB

Good

Over: NHRR

0.3 MI HOLDERNESS TL, Grafton, NH

Built 1964 Load: 44.1 t ADT: 11,400

Showing 1,801-1,850 of 2,542 bridges

Related

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Data sourced from the FHWA National Bridge Inventory (NBI), latest released cycle. See our methodology for details. Retrieved and formatted by PlainBridges Editorial.

Disclaimer: This information is provided for informational purposes only and does not constitute professional advice. Data is sourced from the FHWA National Bridge Inventory (NBI). A "structurally deficient" rating is a repair-priority signal, not a closure or unsafe-to-cross designation. Consult a qualified civil engineer before making decisions based on this data.

Understanding Bridge Conditions

How FHWA rates bridge condition on a 0-9 scale.

Check Your Daily Bridges

How to look up bridge condition data for bridges on your route.

Read our methodology — how this data is sourced, computed, and verified.